Wear; Hart Communication - Siemens 7ML5431 Operating Instructions Manual

Remote operation
7.1 Operating via SIMATIC PDM
Factory Defaults
Factory Defaults resets all parameters to the default settings with the following exceptions:
● Device Address (5.1.) remains unchanged if the reset command is sent remotely (via
AMS, PDM, DTM, FC375) but is reset to 0 if the reset command is sent via LUI.
● Write Protect (6.2.1.) and PIN to Unlock (6.2.2.)
● Learned TVT curve, see Auto False Echo Suppression (2.8.7.1)
1. Open the menu Device – Master Reset, select Yes, and click on OK to perform a reset to
Factory Defaults.
2. After the reset is complete upload parameters to the PC/PG. (If you are performing a
reset after replacing the device with a different instrument, do not upload parameters to
the PC/PG).
7.1.6.13

Wear

Reports the number of hours the device has been operating, and the number of times it has
been powered up.
Open the menu Device – Wear to view:
● Powered Days
● Power-on Resets
Note
Powered days are whole days only. Fractional days are truncated.
7.1.6.14

HART Communication

Sets the number of request/response preambles (default 5).
The preamble consists of three or more hexadecimal FF characters (all 1s). This allows the
receiving modem to get its frequency-detection circuits synchronized to the signal after any
pause in transmission.
We recommend you do not change the default value (5).
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SITRANS LR250 with mA/HART
Operating Instructions, 10/2019, A5E32220602-AG